Cisco Support Community

User receives the TLB (Store) Exception error message

Core Issue

This error message can be hardware or software related and can result in a boot loop or the router getting stuck in ROM Monitor (ROMmon) mode.


To resolve this issue, perform these steps:

  1. This issue can be caused by a software image with a bad checksum. If the router experiences the TLB (Store)Exception error message immediately after a Cisco IOS® Software upgrade, this is likely to be the issue.

Erase the Flash and re-download the Cisco IOS Software image or boot from another software image.

For information on how to erase the Flash, refer to PCMCIA Filesystem Compatibility Matrix and Filesystem Information.

For software upgrade information, refer to the document that applies to your platform:

     2. If the issue occurs immediately after adding hardware, the hardware may be incompatible with Cisco IOS Software.

For minimum versions of Cisco IOS Software needed for the hardware, refer to Software Advisor.

If you have a router that supports a boot image, like the Cisco 7200 or Cisco 7500 series router, verify that the bootflash image supports the hardware installed.

     3. This issue can also be due to a hardware fault, but the error message does not indicate which hardware component is causing the problem.

     Therefore, it is important to remove and reinsert cards to find the problem hardware.

Perform these steps:

a.       For modular routers, remove the cards and reload the router. If the router boots without errors, add cards one at a time to discover the faulty module.

b.      If removing the cards does not solve the problem, try reseating the system Flash and DRAM.

c.       Replace the faulty hardware.

     When hardware replacement is indicated, choose from one of these options:

  • If you have a hardware support contract with Cisco for this part, use the RMA Service Order Tools to request a replacement part directly. 
  • For warranty service, contact the Cisco Technical Support directly at 1-800-553-2447 or online using the TAC Service Request Tool
  • If your product is not covered by contract or warranty, contact your Cisco partner or reseller to request a replacement part for the hardware component that is causing the issue.